Updated service.py - subtitle_pattern change and cookie support

Current ondertitel.com support is broken. They've changed the html layout and are using a cookie now (to prevent hotlinking?). Cookie "download_id" which has to contain "movieid.html" as content. I removed urllib2 and replaced it with requests, much easier to use imho.
Merge pull request #186 from marknl/patch-1

Updated service.py - subtitle_pattern change and cookie support